Phreatic

Phreatic refers to something that happens when water trapped underground suddenly shoots up out of the ground. Imagine you have a water balloon that you've been holding underwater in a pool. If you let go, the water inside the balloon would quickly shoot up to the surface of the pool. This is kind of what happens when there is phreatic activity underground. Water that has been trapped below the surface of the Earth suddenly shoots up and out of the ground, often taking soil, rocks, and other materials with it. This can be caused by things like earthquakes, volcanic eruptions, and changes in the pressure of the water underground. These sudden bursts of water can be dangerous and cause damage, so it's important to be careful around areas where phreatic activity has been known to occur.